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Every 100 years is called a century, made up of 10 decades.
It is meant to describe something occurring 4 times per year, or once per quarter. If you wanted to describe something occurring once every four years, you would say it is a quadrennial event.
Triennial
Triennial, from Latin "triennium".
Every 200 years
decennial Occurring every ten (10) years. Also tenth anniversary
Every 100 years is called a century, made up of 10 decades.
When used as an adjective, it means occurring every, or last for, four years. As a noun, it references an event that occurs every four years. (see: http://dictionary.reference.com/browse/quadrennially )
A bicentenary is a 200th anniversary of a specific event.
Biennial means "occurring every two years," OR "lasting for two years." The word biannual can also mean "occurring every two years," although its most common meaning is "occurring twice a year."
Biannual. Biannual can mean occurring every two years, OR occurring twice a year. Biennial, on the other hand, means only the former: occurring every two years.
It is meant to describe something occurring 4 times per year, or once per quarter. If you wanted to describe something occurring once every four years, you would say it is a quadrennial event.
those are called the Olympics
El Nino
enneatical
Triennial
Relating to, or consisting of, a hundred., Occurring once in every hundred years; centennial., The aggregate of a hundred single things; specifically, a century., A commemoration or celebration of an event which occurred a hundred years before.